Am I bi-sexual ? helpp?

Im a 15 year old girl. I've had boyfriends before and am sexually attracted to guys for the most part , but for some reason I feel like I might like girls too. I kinda feel like i could be way more emotionally attracted to girls then guys. but then way more sexually attracted to guys then girls. It's really confusing & I dont know what to do /: I also kinda feel like I might have feelings for my bestfriend, and i'm pretty sure shes not even bi. I don't wanna feel like a creeper or anything liking her because she isn't bi && I couldnt even imagine telling her I think I like her. I don't even like thinking about it because I hate the fact of thinking im actually bi-sexual. I just don't know what to do. Adviceee ?